If you need a tool to make bulk corrections and translations to text without word count limits, BulkCorrector is a great option. The tool is geared for large documents like books, and offers both free and premium options. The premium version can handle documents of any size, lets you use custom prompts and translate into all languages, so it's good for serious authors.
Another high-powered option is O.Translator, an AI-powered tool to translate documents, which works with more than 60 languages and preserves formatting on a variety of file types, including PDF, DOCX and XLSX. It's relatively inexpensive to translate documents, and Google touts data security with its encrypted storage.
If you need a translation tool that can handle a variety of situations, PDF Translator & Editor translates many file types, including scanned PDFs and photos, into 136 languages. It preserves the original formatting and layout, which is good for people who need translations that don't require a lot of editing.